The correct answer to the question is that D). Transverse because of the direction that the wave is traveling.
EXPLANATION:
Before going to answer this question, first we have to understand the nature of transverse and longitudinal wave.
A transverse wave (except light) is a type of mechanical wave in which the direction of vibration of particles is perpendicular to the direction of wave propagation. This type of wave is propagated in a medium in the form of crests and troughs.
A longitudinal wave is a type of mechanical wave in which the direction of vibration of particles is parallel to the wave propagation. This type of wave is propagated in the form of compression and rarefaction. Compression is the high pressure region in a wave where particles are very close to each other, and rarefaction is the low pressure region where particles are far away from each other.
As per the question, the particles of the medium are displaced perpendicular to the wave motion. Hence, the wave will be transverse in nature.
